The Collaborative International Dictionary of English v.0.48:
blither \blither\ v. same as blather. Syn: babble, blather, smatter, blether. [WordNet 1.5]WordNet (r) 3.0 (2006):
blither v 1: to talk foolishly; "The two women babbled and crooned at the baby" [syn: babble, blather, smatter, blether, blither]